User's Guide
5. Cleaning
the meter
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Continue on the four edges and the back of the meter wiping two
forward and backward strokes and two left and right strokes on
each surface.
Always tilt the meter so that the strip port points slightly
downward to avoid fluid entering the port.
D. Pick up the strip port cover and gently clean its front and back
using your thumb and forefinger. Ensure the cap is visibly damp
on all surfaces. You should pay particular attention to places
where debris and fluids can gather (e.g. around the strip entry slot
and in the channels inside the strip port cover).